I would not buy one from TOW. If I was going to buy a parts set I would get it from Tip Curtis. His has more wood left on it so you can make changes.
On all of them you inlet the lock 75% of the way & then move the barrel back to where you need it for the vent to b correct.
I wouldn’t trust any of them to send you a quality stock. I’ve used all of them mentioned & had issues with their stocks. Unless you Hand Pick then, you could end up with anything.
The best stock shaper/inletter I know is Mark at Jacks Mountain stocks. Get the stock shaped & barrel inlet & RR hole drilled & do your own inletting. Mark does a great job & a fair price.
I’ve built 2 Kecks, over 12 TOW, 6 Pecatonica, 3 Chambers, 9 Dunlaps, 16 Tip Curtis & 27 from Jacks Mountain Stocks & lots of others. Hands down Jacks stock work is superior to me. And his barrel inletting is not just close, it is absolutely perfect. He’s not running 20 stocks at a time, he does Your one for You.
Now it is not a kit, but if you have errors, you made them. You are not patching up everyone else’s errors from worn out duplicator patterns.